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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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Example<br />

PPLOT 1233<br />

PPLOT X1 Y1 Z1<br />

/FRACTION=VW.<br />

PPLOT APPLY<br />

/FRACTION=BLOM.<br />

• The first command uses van der Waerden’s transformation to calculate expected normal<br />

values of X1, Y1, and Z1.<br />

• The second command uses Blom’s transformation for the same three series.<br />

Example<br />

PPLOT VARX<br />

/FRACTION=RANKIT<br />

/DIFF<br />

/STANDARDIZE.<br />

PPLOT VARY<br />

/APPLY<br />

/NOSTANDARDIZE.<br />

• The first command differences and standardizes series VARX and then produces a normal<br />

probability plot using the RANKIT transformation.<br />

• The second command applies the previous plot specifications to VARY but does not standardize<br />

the series.<br />

<strong>Reference</strong>s<br />

Blom, G. 1958. Statistical estimates and transformed beta variables. New York: John Wiley and<br />

Sons.<br />

Chambers, J. M., W. S. Cleveland, B. Kleiner, and P. A. Tukey. 1983. Graphical methods for data<br />

analysis. Belmont, Calif.: Wadsworth International Group; Boston: Duxbury Press.<br />

Lehmann, E. L. 1975. Nonparametrics: Statistical methods based on ranks. San Francisco:<br />

Holden-Day.<br />

Tukey, J. W. 1962. The future of data analysis. Annals of Mathematical Statistics, 33:22.

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